perniciously

Definition of Perniciously in English :

1. insidiously, perniciously

in a harmfully insidious manner

Example Sentences:
'these drugs act insidiously'

2. banefully, perniciously

in a noxiously baneful way

Example Sentences:
'this banefully poisoned climate'

WordNet Lexical Database for English. Princeton University. 2010.

Perniciously

adjective

1.

wicked or malicious

pernicious lies

2.

causing grave harm; deadly

adjective

1.

causing great injury, destruction, or ruin; fatal; deadly

2. Rare

wicked; evil

adj.

1. Tending to cause death or serious injury; deadly: a pernicious virus.

2. Causing great harm; destructive: pernicious rumors.